2001 XJR Hesitation at 3000 rpm
#1
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2001 XJR Hesitation at 3000 rpm
I was driving my wife's XJR the other day. As I was merging onto the freeway the car started to hesitate. It seems to consistently do it under heavy acceleration. But, in the drive way as I rev the engine it starts to hesitate (it doesn't seem to be missing really, more like a fuel or air problem) right at 3000 rpm.
I know there are other similar posts, but running it in the driveway and getting the same symptom, seems a bit different. It should take less fuel in neutral than under heavy acceleration on the freeway.
Thanks for your help.
I know there are other similar posts, but running it in the driveway and getting the same symptom, seems a bit different. It should take less fuel in neutral than under heavy acceleration on the freeway.
Thanks for your help.
Last edited by JRG-XJR; 06-12-2009 at 09:38 PM.
#2
I was driving my wife's XJR the other day. As I was merging onto the freeway the car started to hesitate. It seems to consistently do it under heavy acceleration. But, in the drive way as I rev the engine it starts to hesitate (it doesn't seem to be missing really, more like a fuel or air problem) right at 3000 rpm.
I know there are other similar posts, but running it in the driveway and getting the same symptom, seems a bit different. It should take less fuel in neutral than under heavy acceleration on the freeway.
Thanks for your help.
I know there are other similar posts, but running it in the driveway and getting the same symptom, seems a bit different. It should take less fuel in neutral than under heavy acceleration on the freeway.
Thanks for your help.
I did check the partial load tube, an easy way to check for its condition was to pull it from the valve cover (no easy task) and press your thumb over the tube opening. Vacuum should pull your skin tight while the engine is running at idle and no hissing anywhere else should be heard (over engine noise can be hard to hear). Just kind of a shade tree mechanic way of checking the hose, since all that is needed here is vacuum to determine that the hose should be working well enough to function.
I also performed the 'clearing' of the valve cover side, though I did not use a drill bit, instead found a wire of roughly the same diameter and bent a loop in the other end so that it could not fall down inside the valve cover. Mine though was not obstructed.
#4
The MAF cleaning has worked wonders on my car though, feels like it did when I first bought it.
One thing though, removing the negative battery terminal did not clear the engine light. I also did the positive one and as well unplugged totally the ECU. Nothing has reset the light, in the past it has just shut off but it has been on now for a couple days.
Engine codes were just about running lean problems, which feels like cleaning the MAF sensor has resolved (as the symptoms are no longer there). Will the system eventually reset itself or is there another way to clear the code without dealer involvement?
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#8
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Had the same hesitation problem, I have Jaguar mechanic on staff and he was very quick to find the problem. He said 9 out of 10 times the vacuum line from the supercharger to the fuel pump is the culprit. In my case this was true, the line is standard vacuum line about $2 a foot. The line makes a very sharp turn at the S/C and eventually will collapse at the turn. Replaced the line runs like it should. A simple and cheap fix.
#9
Thanks for explaining the Rev limiter on my XKR at 3000 rpm at idle. This worried me, as I had just had all of the timing plastic parts done & it popped on the left pipe at 3000 rpm. I was thinking one of valves was worn. Feel happier that all is in order.
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2001, 3000, acceleration, heavy, hesistates, hesitates, hesitating, issues, jaguar, low, maf, problem, rpm, stype, xjr
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